I will be hiring a car in Hungary, then cross the border to Serbia. Officially you don't need an international driving licence because Serbia is supposed to accept Dutch driving licences.
However, we heard that sometimes the police at the border do make a fuss and you end up paying for some rules they make up.
How often does this happen, how corrupt are officials there even now?
Update: I'm back, and it turned out not buying one was the right choice. At the border crossing they only checked passports, and going from Serbia to Hungary they checked the trunk (against human trafficking, all luggage could stay closed).